| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
|
| Presentation Title |
Effects of Cr On 1/2<111> to <100> Loop Transformation in Concentrated Fe-Cr Alloys under Irradiation |
| Author(s) |
Xian-Ming Bai |
| On-Site Speaker (Planned) |
Xian-Ming Bai |
| Abstract Scope |
Fe-Cr based ferritic alloys are promising structural and cladding materials for next-generation reactors. Numerous experiments have shown that radiation can produce both 1/2<111> and <100> interstitial-type dislocation loops in these alloys. However, contradictory experimental evidence also exists regarding how Cr influences the relative abundance of the two loop types. In this work, molecular dynamics modeling is used to simulate the direct transformation from a 1/2<111> to a <100> loop based on the cascade overlapping mechanism in a series of Fe-Cr alloys and pure Fe. Our results show that the loop transformation probability decreases with the increasing Cr concentration. Further molecular statistics calculations show that the average formation energy of a <100> loop increases at a much faster rate than that of a ½<111> loop as Cr concentration increases, providing a reasonable explanation for why Cr suppresses the formation of <100> loops in Fe-Cr alloys as observed in many experiments. |